[quote author=Altezza-Dan link=topic=28768.msg334599#msg334599 date=1295987674]
is it at home or in work? If at home did you add any new devices onto your network? Most new devices should get a new mac address automatically, unless one has a static ip address that doesnt change. there is settings you can change in your network router if your handy enough with all that pc jazz
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All MAC Address are hard coded and unique, the IP address can be dynamic